Ink cartridge



FIG. 1 is a perspective front view of an ink cartridge showing my new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a another side view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a rear view thereof.

The broken lines are for illustration only and form no part of the claim design. 

The ornamental design for an ink cartridge, as shown and described. 